noredink-ui/prelude/asserts.bzl

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Python
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# Copyright 2017 The Bazel Authors. All rights reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# @lint-ignore-every LICENSELINT
"""Testing support.
This is a modified version of https://github.com/bazelbuild/bazel-skylib/blob/main/lib/unittest.bzl.
Currently, if there are any failures, these are raised immediately by calling fail(),
which trigger an analysis-time build error.
"""
def _assert_equals(expected, actual, msg = None):
"""Asserts that the given `expected` and `actual` are equal.
Args:
expected: the expected value of some computation.
actual: the actual value return by some computation.
msg: An optional message that will be printed that describes the failure.
If omitted, a default will be used.
"""
if expected != actual:
expectation_msg = 'Expected "%s", but got "%s"' % (expected, actual)
if msg:
full_msg = "%s (%s)" % (msg, expectation_msg)
else:
full_msg = expectation_msg
fail(full_msg)
def _assert_true(
condition,
msg = "Expected condition to be true, but was false."):
"""Asserts that the given `condition` is true.
Args:
condition: A value that will be evaluated in a Boolean context.
msg: An optional message that will be printed that describes the failure.
If omitted, a default will be used.
"""
if not condition:
fail(msg)
def _assert_false(
condition,
msg = "Expected condition to be false, but was true."):
"""Asserts that the given `condition` is false.
Args:
condition: A value that will be evaluated in a Boolean context.
msg: An optional message that will be printed that describes the failure.
If omitted, a default will be used.
"""
if condition:
fail(msg)
asserts = struct(
equals = _assert_equals,
true = _assert_true,
false = _assert_false,
)